Beiträge von Tommy Einarsson

Thank you for your help!
With a of using my own brain I got it. I had used 1 phase for all inputs.... One of the drawings had that.... I just took the easy way out instead of thinking a bit

0,78kW is the pool pump using!

Moved the clamps far away from the contactor (and the pump/heater)

Still having the problem with one phase showing 120W instead of ~260W. The first phase has a power factor of 0.30, the other two 0.7 - 0.85.
I will try to disconnect the Sonaff breaker (https://sonoff.tech/product/diy-smart-switch/th10-th16/) and see if it changes.
When the pump and heater are turned off, I have a consumption on one phase of -95W. If I can somehow raise that value to -2000W I think I'm prepared for the winter

Zitat von thgoebel

Thanks for the picture, Tommy Einarsson ! Seems to me quite clear that the current clamp at the grey wire is mounted in reverse direction. Assuming the AEG part in the left is the contactor for the 3phass pump motor, I would suggest to separate the current clamps with more distance from the contactor. The activated contactor radiates a magnetic field which may influence the current measurement.

I hade to change the direction of the clamp with the grey wire, it was showing a negative value.
I will also try to separate the clamps from the contactor more.

Hi,

Ignore the previous message, trying to have this discussion on two separate computers can be hard....
Anyway, the 3M is connected as in fig 4 in the small paper. Neutral to Neutral, Live wire connected to all three inputs and each of the clamps are connected to each of the incoming phases. I don't use the breaker in the #m, it's only connected for measuring.
I know the installation looks like sh$t but it's only temporary to make sure everything works until I install it properly.

The three phases are brown, black, and white/grey

Zitat von thgoebel

My question was not if all cables were thoroughly connected - just wanted to know if the wire at terminal VA (for example) has the same potential as the wire where the current clamp connected with IA is located. (Same question for VB/IB and VC/IC.)

Zitat von thgoebel

It is very likely that the current clamps are not correctly assigned. Would you please take some pictures of the Shelly and the clamps in their biotope?

Ah, now I get it
Will check that later as well.

Zitat von thgoebel

My question was not if all cables were thoroughly connected - just wanted to know if the wire at terminal VA (for example) has the same potential as the wire where the current clamp connected with IA is located. (Same question for VB/IB and VC/IC.)

Ah, misunderstood you there, even though I'm not sure how to check the potential...
The three phases comes directly from the same central so there shouldn't be any trouble there.

I just saw that when I turn off the heater and the pump I get this...

There must be something with the wiring of the contactor or the breaker for the contartor...

Zitat von thgoebel

The reason for the nearly half active power at phase B is the low power factor - current at phase B and C are the same. The reason could probably be a special kind of 3 phase motor in the pump, but this is not very likely. Would you please double check if current clamps and voltage pins (VA, VB and VC) are correctly assigned?

And, by the way: Welcome to the forum!

Re-connected all cables, no luck.
Will check later tonight to put all three on the same phase to see what the results are

Hi,

I have just connected my 3EM to see how much my pool heater and pool pump consumes.

The pump runs on three phases and the heater is on one phase.

Phase A har the heater so Phase B and Phase C should be identical.

Can someone explain to me why it differs and how I can get the correct values?

Phase B has probably the contactor for the pool pump as well.